Jimmy Hoffa was whacked by a mob enforcer and buried in the foundation of the General Motors’ headquarters, the Renaissance Center in Detroit, the Teamster boss’ driver claims in a new book.

“It was his own people who did it,” claims chauffeur-turned-informant Marvin Elkind, the subject of “The Weasel: A Double Life in the Mob” by Canadian journalist Adrian Humphreys.

“Mr. Hoffa gave them no choice. He was very close to Tony Jack [Detroit capo and union heavy Anthony Giacalone], and everyone knows he provided the triggerman. Tony Jack told me. He didn’t say, ‘Marvin, I provided the triggerman.’ But he told me in another way.”

Elkind claims this revelation came during a Teamsters conference in Detroit in 1985, 10 years after Hoffa disappeared while on his way to meet Giacalone and gangster Anthony “Tony Pro” Provenzano.

“Let’s take a break. Let’s get out of here,” Giacalone announced to a group of delegates.

The group was heading away from the Omni International across a glassed-in walkway when the Renaissance Center, which was under construction when Hoffa vanished, came into view.

Elkind adds that he’d heard from other Detroit mobsters that after Hoffa was snatched and killed, “practically every union carpenter in and around the city was called in to rush the construction of wooden forms needed for pouring concrete at the Renaissance project.”

“There was a mad rush to get the concrete poured,” claims Elkind, who says Hoffa’s body was slipped into wet cement.